Moisture and hydrogen-induced embrittlement of Fe3Al alloys

Environmental embrittlement types of Fe3Al and Fe3Al–5Cr alloys have been evaluated using hydrogen microprint technique and tensile test in this study. The hot rolled iron aluminides offer better tensile strength and ductility in comparison to the as-cast iron aluminides in all test environments. Due to the fact that hydrogen transport in Fe3Al and Fe3Al–5Cr alloys is mainly lattice diffusion, the cleavage strength is decreased significantly by hydrogen.